As it stands, Bitcoin, gold and a few other things will be subject to unrealized capital gains tax from 2028 until at least 2031, after which a (potential) new law switches everything to (regular, realized) capital gains. Or not, if the coalition implodes before it manages to pass that law and the next coaltion is left-wing, or just "needs" the money and doesn't care too much about crypto and precious metals investors.
We should have more clarity in early November.
Relevant letter:
https://www.tweedekamer.nl/kamerstukken/brieven_regering/detail?id=2026Z20444&did=2026D47255